int main()
{
int t, b;
t = t+ 10 - 2 * 20 / 30;
t -= b  %= ++ t;
t += b *= t /= t++;

t &= b |= b;// ^= t;

!b;

t < 20 && b > 20 || t < 30 || t == b;// || b  <= 40;
t >= 50; 
t != b;
return 0;
} 